NetBSD 5 upgrade & SCSI issues

I just upgraded a PowerMac 9600 with an ATTO UL2D SCSI card, an Acard
SCSI-SATA adapter, and a hardware mirroring SATA enclosure from NetBSD 4
to NetBSD 5, and I'm now seeing SCSI issues I didn't see with NetBSD 4.
The machine runs, and appears to be fine, but it's not reassuring to see
these: